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Factors of relevance for improving the uniformity of oxygen distribution in drip irrigation water

journal contribution
posted on 21.07.2021, 03:44 by Hongjun Lei, Huan Liu, Ronald BalsysRonald Balsys, David MidmoreDavid Midmore, Min Zang, Surya BhattaraiSurya Bhattarai
Aerating water using microbubbles in irrigation for drip and subsurface drip irrigation systems has been reported to produce positive effects on plant growth and yield. However, maintaining the uniformity of bubble distribution in irrigation lines across long-row configuration is a challenge. Air injection of microbubbles in irrigation water using a gas diffuser (Seair Diffusion System, Model SA75) has a significant gain in dissolved oxygen (DO) distribution over 850 m length of drip tape. Furthermore, with oxygen injection with a Venturi, DO in irrigation water reached as high as 44 ppm and was maintained well above 35 ppm up to a distance of 700 m and did not drop below 20 ppm, even at a distance of 850 m. Pressure compensated emitters recorded significantly higher DO concentrations compared to non-pressure compensated emitters along the entire length of the irrigation line. Additionally, use of surfactant in irrigation water, up to 4 ppm, resulted in increased gas void fraction and DO concentration compared to the control for both air and oxygen injection irrigation. Highest oxygen saturation was recorded with 4 ppm surfactant, both for air injections (165%) and oxygen injection (438%) treatment along 200 m of non-pressure compensated drip tape.

History

Volume

69

Issue

5

Start Page

1133

End Page

1145

Number of Pages

13

eISSN

1531-0361

ISSN

1531-0353

Publisher

John Wiley & Sons

Language

en

Peer Reviewed

Yes

Open Access

No

Acceptance Date

15/06/2020

Author Research Institute

Institute for Future Farming Systems

Era Eligible

Yes

Journal

Irrigation and Drainage